linux-kernel - Re: [PATCH V14 1/2] scsi: ufs: set the device reference clock setting

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Date:   Mon, 24 Sep 2018 07:58:04 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Sayali Lokhande <sayalil@...eaurora.org>,
        "subhashj@...eaurora.org" <subhashj@...eaurora.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "vivek.gautam@...eaurora.org" <vivek.gautam@...eaurora.org>,
        "rnayak@...eaurora.org" <rnayak@...eaurora.org>,
        "vinholikatti@...il.com" <vinholikatti@...il.com>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "evgreen@...omium.org" <evgreen@...omium.org>,
        "riteshh@...eaurora.org" <riteshh@...eaurora.org>
CC:     "stummala@...eaurora.org" <stummala@...eaurora.org>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "jlbec@...lplan.org" <jlbec@...lplan.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V14 1/2] scsi: ufs: set the device reference clock setting


>+static struct ufs_ref_clk ufs_ref_clk_freqs[] = {
>+       {19200000, REF_CLK_FREQ_19_2_MHZ},
>+       {26000000, REF_CLK_FREQ_26_MHZ},
>+       {38400000, REF_CLK_FREQ_38_4_MHZ},
>+       {52000000, REF_CLK_FREQ_52_MHZ},
>+       {0, REF_CLK_FREQ_INVAL},
>+};
>+
>+static inline enum ufs_ref_clk_freq
>+ufs_get_bref_clk_from_hz(u32 freq)
>+{
>+       int i = 0;
>+
>+       while (ufs_ref_clk_freqs[i].freq_hz != freq) {
>+               if (!ufs_ref_clk_freqs[i].freq_hz)
>+                       return REF_CLK_FREQ_INVAL;
Is the if clause really needed?
you will return REF_CLK_FREQ_INVAL anyway

>+               i++;
You might overrun here if freq is not what you've expected

>+       }
>+
>+       return ufs_ref_clk_freqs[i].val;
>+}